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The formula itself is simple, but taking into account all the possible conversions can get a little overwhelming. So let's run through a few examples. Example 1: Battery Capacity in Amp Hours, Charging Current in Amps
On Quora, a username ATO Inc shares their experiences and insights about what can happen when your battery’s voltage drops during charging. Thus, as long as you replace your power supply with one capable of providing as much or more amps than the previous, you’ll be fine. In other words, there is nothing wrong with having a charger capable of providing more amps than needed. Polarity As long as the voltage matches that expected by the connected device, then yes, you can use an AC adapter capable of providing higher amps. Can I use a 5V 2A charger with a 5V 1A device? As a result, you will be able to get more work done before the battery with the higher Ah rating needs to be recharged. Usually, you will use a 4.0Ah battery in larger tools that draw more power or in tools that you need to use for extended periods. A 2.0Ah battery, on the other hand, is better if you only need to use a tool for a short period and you value ease of use and lightweight, simple to handle tools over ones with an extended battery life. How Long Does a 4.0 Ah Battery Last?In this example, it will take about 6.7 hours to fully charge your battery from 80% DoD. Example 3: 95% DoD The NOCO Genius2 is suitable for use with many types of battery including lead acid in both 6 and 12 volts plus 12v gel type and AGM batteries. It is even compatible with lithium ion batteries. A re-designed clamp provides easy attachment to battery terminals of all shapes and sizes including M6 male and female threaded terminals. As long as the correct voltage is used, a device will draw only the amperage it needs, meaning there will not be “too many amps”. If an incorrect voltage is used — say a higher voltage than the device is rated to accept — then yes, too many amps may be drawn, and the device can be damaged. This is why it’s critical to use the correct voltage. Can I use an AC adapter with higher amps? I have a Nintendo 3ds that requires 4.6 Volts and 900 mA (you might as well say 1 amp). Older Nintendo DS’s required 5 Volts so I was ok cutting the charger cable and making my own USB charger out of it so I can either charge it in the wall or with a portable charger. For those interested in the underlying math, here are 3 formulas to for calculating battery charging time. I start with the simplest and least accurate formula and end with the most complex but most accurate. Formula 1
Tip: You can estimate how much battery capacity you need by using the inverse of this formula: amps × hours = amp hours. Example 2: Battery Capacity in Watt Hours, Charging Rate in Watts
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Let's revisit this setup, but this time assume our lead acid battery has a 50% DoD. (Most lead acid batteries should only be discharged to 50% at most to preserve battery life.) Note: Real-world charge efficiency is not fixed and varies throughout the charging process based on a number of factors, including charge rate and battery state of charge. The faster the charge, typically the less efficient it is. Example 1: Lead Acid Battery However, there is often a trade off involved with a higher Ah value. The battery may be bigger and heavier, and if you are using tools in a tight space or at height, you may prefer a lightweight tool. In this case, a lower Ah battery could actually suit your needs better. Does a Higher Amp Hour Battery Give More Power? First, you need to assume a charge efficiency. Based on the battery being a lithium battery and the charge rate being relatively fast, you assume the charge efficiency is 90%.
It’s very important to get the right voltage. Some devices are tolerant of variations and work just fine. Others, unfortunately, are not tolerant at all. Depending on how different the supplied voltage is from what’s required, the device may simply fail, it may work “kind of”, or it may appear to work at the cost of a much shorter lifespan. Recall, that, using Formula 1, we estimated the charge time for this setup to be 10 hours. Just by taking into account charge efficiency our time estimate increased by nearly 2 hours. Example 2: LiFePO4 Battery Most power supplies provide their output on two wires: one labeled (+) or positive, and the other (-) or negative. Which wire is which is referred to as polarity.Because your units are again 'matching', to calculate charging time you again simply divide battery capacity by charging rate. 1200Wh ÷ 150W = 8 hrs Next, you convert battery capacity from milliamp hours to amp hours by dividing milliamp hours by 1000. 3000mAh ÷ 1000 = 3Ah And sometimes, your units are mismatched. Your battery capacity may be given in watt hours and your charge rate in amps. Or they may be given in milliamp hours and watts.
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